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12-04-2011, 07:21 AM   #1
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K10D with Minolta lense adapter

Hi guys. I have a K10D that I am very happy with. I know its obsolete, but I like it.

I have some old manual Minolta lenses from my X-370, So I bought an adapter ring. Works fine.

However, in Manual mode, I have no metering at all. I can use the "green button" and that give me a shutter speed in proportion to my lense opening, but I am adjusting more by eye thru the eyepiece.

Am I missing something?

Ian R.

12-04-2011, 07:50 AM   #2
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The k10d is still an excellent camera and you should be happy with it.

Everything I've read is that you can't use Minolta lenses on k-mount cameras because of the focus distance (not sure if that is the correct term) being greater than that of the k-mount so you can't get good focus with it. Doing stop-down metering is the way this would have to work. I have a Nikon lens converted to k-mount and it works the same way. So perhaps I'm missing something. I 'thought' you can do what you are saying you are doing...hmmm. Were did you get your adapter?
12-04-2011, 07:58 AM   #3
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The best way to use the adaptor, and I assume it is optically corrected to give infinitybfocus, is to shoot in Av mode, because when you stop down the lens manually the camera adjusts the shutter speed accordingly. This works as long as you have set the use aperture ring function to permitted
12-04-2011, 01:07 PM   #4
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The kicker is the flange-focal distance (FFD) or register, the distance from the lens mount to the camera frame (film or digital), Pentax PK|M42 register is 45.46mm; Minolta M/MD register is 43.7mm. Minolta lenses must have about 2mm removed from the lens body (and any internal bits) to achieve infinity focus on a PK mount. Or they need an optical adapter, a short telextender that increases the lens' focal length, tightens its maximum aperture, and degrades image quality somewhat.

I assume you have set the Custom Menu item APERTURE RING to PERMITTED. Any adapted lens should meter on your dSLR in Av mode. And any lens should meter in M mode. If the lens is auto-aperture-only, it will only work with the aperture wide open -- but I don't think this applies to M/MD lenses. I don't have any suggestions, sorry.


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